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An image B is formed of a real point obj...

An image B is formed of a real point object A by a lens whose optic axis is XY.
(a) Draw a ray diagram to locate the lens and its focus point.
(b) If A and B are separated by 20 cm along the axis, find the focal length of the lens.

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The correct Answer is:
(b) concave lens, focal length `= 15cm`
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